CN208797618U - A kind of safety circuit and household appliance - Google Patents
A kind of safety circuit and household appliance Download PDFInfo
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- CN208797618U CN208797618U CN201821469370.XU CN201821469370U CN208797618U CN 208797618 U CN208797618 U CN 208797618U CN 201821469370 U CN201821469370 U CN 201821469370U CN 208797618 U CN208797618 U CN 208797618U
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Abstract
The utility model relates to safety technical field, a kind of safety circuit and household appliance are provided.The safety circuit includes safety capacitor, full bridge rectifier, discharge circuit and switching circuit；The safety capacitance connection is between the first input end and the second input terminal of the full bridge rectifier；The discharge circuit is in parallel with the safety capacitor；The switching circuit is connected between the first output end of the full bridge rectifier and second output terminal；In standby mode, the switching circuit work is on state, also, external power supply consumes power by the switching circuit after full bridge rectifier rectification；In the shutdown state, in off state, the discharge circuit discharges the electricity of the safety capacitor storage for the switching circuit work.The utility model can be realized in the discharge circuit of safety capacitor, and the stand-by power consumption of product is not dependent on the capacity of safety capacitor.
Description
[technical field]
The utility model relates to safety technical field more particularly to a kind of safety circuit and household appliances.
[background technique]
Most of household appliances product have safety in terms of requirement, such as CE, 3C, UL etc..Important one is anti-among these
It only shocks by electricity, the requirement to the product of institute's application authentication is the voltage of the electric appliance input port in 1 second after disconnecting power outlet
Drop to the voltage of defined or less.
Current main settling mode include for safety capacitor in such a way that discharge resistance directly discharges or dedicated core
The mode of piece electric discharge.The mode such as directly discharged according to discharge resistance, it is electric using safety is connected in parallel on after AC power source disconnection
The discharge resistance for holding both ends discharges, this mode structure is simple, still, can consume power always when state when complete machine works,
Especially in the biggish situation of safety capacitance, the resistance value needs of discharge resistance are arranged smaller, and the smaller consumption of resistance value
Power it is bigger, lesser discharge resistance will lead to biggish stand-by power consumption, and then increase the difficulty that product is verified by safety
Degree.
[utility model content]
In order to solve the above-mentioned technical problem, the utility model embodiment provides a kind of safety circuit and household appliance,
It can be realized in the discharge circuit of safety capacitor, the stand-by power consumption of product is not dependent on the capacity of safety capacitor.
In order to solve the above technical problems, the utility model embodiment the following technical schemes are provided:
The utility model embodiment provides a kind of safety circuit, including safety capacitor, full bridge rectifier, discharge circuit
And switching circuit；
The safety capacitance connection is between the first input end and the second input terminal of the full bridge rectifier；
The discharge circuit is in parallel with the safety capacitor；
The switching circuit is connected between the first output end of the full bridge rectifier and second output terminal；Standby
When state, the switching circuit work is on state, also, external power supply leads to after full bridge rectifier rectification
Cross the switching circuit consumption power；In the shutdown state, in off state, the discharge circuit is released for the switching circuit work
Put the electricity of the safety capacitor storage.
Further, the switching circuit includes:
First switch circuit, the first switch circuit connection is in the first output end of the full bridge rectifier and second
Between output end；
Second switch circuit, including switch control terminal, switch input terminal and output switching terminal, the switch control terminal and institute
Switch input terminal is stated with the first switch circuit connection, and the output switching terminal connect with the discharge circuit, wherein
When standby mode, the first switch circuit work is on state, and the second switch circuit work is in off state；It is closing
When machine state, the first switch circuit work is in off state, and the second switch circuit work is on state.
Further, the first switch circuit includes first capacitor, voltage-stabiliser tube, first resistor and the first triode；
The anode of the first capacitor is connect with the first output end of the full bridge rectifier, and the first capacitor is born
Pole is connect with the second output terminal of the full bridge rectifier and ground terminal respectively；
The anode of the voltage-stabiliser tube is connect with one end of the first resistor, the cathode of the voltage-stabiliser tube and first electricity
The anode connection of appearance；
The first resistor other end is connect with the cathode of the first capacitor.
Further, the second switch circuit includes second resistance, the second triode and 3rd resistor；
One end of the second resistance is connect with the cathode of the voltage-stabiliser tube, the other end of the second resistance and described the
The base stage of two triodes connects；
The emitter of second triode is connect with the ground terminal, the collector of second triode and the third
One end of resistance connects；
The other end of the 3rd resistor is connect with the discharge circuit.
Further, the discharge circuit includes the first discharge circuit and the second discharge circuit；
First discharge circuit connects with the output switching terminal, second discharge circuit and the safety capacitor respectively
It connects；
Second discharge circuit also with the output switching terminal and the safety capacitance connection.
Further, first discharge circuit includes the 4th resistance and first diode；
One end of 4th resistance is connect with one end of the safety capacitor, the other end of the 4th resistance with it is described
The anode connection of first diode；
The cathode of the first diode is connect with the other end of the 3rd resistor.
Further, second discharge circuit includes the 5th resistance and the second diode；
One end of 5th resistance is connect with the other end of the safety capacitor, the other end of the 5th resistance and institute
State the anode connection of the second diode；
The cathode of second diode is connect with the other end of the 3rd resistor.
Further, the safety capacitor is connect with the external power supply.
Further, the safety capacitor is connected in parallel between the firewire and zero curve of the external power supply.
The utility model embodiment additionally provides a kind of household appliance, including safety circuit as described above.
The beneficial effects of the utility model are: compared with prior art, the utility model embodiment provides a kind of peace
Advise circuit and household appliance.The safety circuit in standby mode, pass through on state, external power supply by switching circuit work
After full bridge rectifier rectification, power is consumed by switching circuit, in the shutdown state, switching circuit works in off state,
Discharge circuit discharges the electricity of safety capacitor storage.Therefore, the utility model can be realized in the discharge circuit of safety capacitor,
The stand-by power consumption of product is not dependent on the capacity of safety capacitor.
[Detailed description of the invention]
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of structural schematic diagram of household appliance provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of safety circuit provided by the embodiment of the utility model；
Fig. 3 is a kind of structural schematic diagram for safety circuit that another embodiment of the utility model provides；
Fig. 4 is a kind of structural schematic diagram for safety circuit that another embodiment of the utility model provides；
Fig. 5 is a kind of circuit connection diagram of safety circuit of Fig. 4.
[specific embodiment]
The application in order to facilitate understanding with reference to the accompanying drawings and detailed description carries out in more detail the application
It is bright.It should be noted that it can be directly to another yuan when an element is expressed " connection " another element
Part or elements placed in the middle there may be one or more therebetween.In addition, term " first ", " second " etc. are only used for description mesh
, it is not understood to indicate or imply relative importance.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Term used in the description of the utility model is intended merely to
The purpose for describing specific embodiment is not intended to limitation the utility model.Term "and/or" packet used in this specification
Include any and all combinations of one or more related listed items.In addition, the application disclosed below is different real
Applying technical characteristic involved in example can be combined with each other as long as they do not conflict with each other.
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of household appliance provided by the embodiment of the utility model.Such as Fig. 1 institute
Show, the household appliance 200 includes safety circuit 100.
Household appliance 200 includes kitchen series, bathroom series, cleaning series, environment series, heater class, audiovisual class, protects
Strong series and other classes etc..Wherein, the kitchen series includes electric cooker, refrigerator etc., and the bathroom series includes electric hot water
Device, washing machine etc., the cleaning series includes dust catcher, electric iron etc., and the environment series includes electric fan, air cleaning
Device, air-conditioning etc., the heater class include electric heater, over blanket etc., and the audiovisual class includes television set, computer etc., the guarantor
Strong series includes beautiful container, massager etc., other described classes include lamps and lanterns, intelligent intercom etc..
The safety standard Primary Reference GB4706 series standard of household appliance 200, wherein GB4706.1 is the universal standard,
Title is " household and similar applications security appliance ".There is special standard for specific household appliance 200, in addition, family
The components of electric equipment 200 need to be differentiated as the case may be, are applicable in different regulation and testing standard.
Please see Fig. 2 to Fig. 4, the safety circuit 100 includes safety capacitor 10, full bridge rectifier 20, discharge circuit
30 and switching circuit 40.
The safety capacitor 10 is connected between the first input end and the second input terminal of the full bridge rectifier 20.?
In the present embodiment, the safety capacitor 10 is connect with the external power supply, and the safety capacitor 10 is connected in parallel on the external power supply
Firewire and zero curve between.
The safety capacitor 10 must have safety certification by the certification of release mechanism, 10 marked thereon of safety capacitor
Mark, pressure resistance and ripple current.Consider for security performance and EMC, generally can increase safety electricity in the inlet of AC power source
Hold 10, can be used to inhibit EMI Conduction Interference, if safety capacitor 10 is applied in power-supply filter, can to common mode and
DM EMI plays filter action.
In the present embodiment, the safety capacitor 10 is X capacitor, and X capacitor belongs to one kind of safety capacitor, safety standard rule
It is fixed, when machine or equipment power supply line among working are unplugged, in two seconds, the electricity of power-line plug both ends electrification
Pressure (or above earth potential) is necessarily less than the 30% of rated operational voltage, therefore X capacitor has to connect to few 30 (example of discharge circuit all the way
Such as, in the both ends of an X capacitor discharge resistance in parallel), when preventing power supply line plug, due to the charge and discharge process of X capacitor
And lead to the long charged injury caused to human body of power-line plug.
The full bridge rectifier 20 is also connect with the discharge circuit 30 and switching circuit 40, the full bridge rectifier
20 include first input end (port 1 as shown in Figure 5), the second input terminal (port 2 as shown in Figure 5), the first output end (such as
Port 3 shown in fig. 5) and second output terminal (port 4 as shown in Figure 5).
The external power supply connected by household appliance 200 is alternating current, in actual use, passes through the household appliance
In 200 power supply line access power grid, electric main is provided for the household appliance, the full bridge rectifier 20 can be by high pressure
For AC conversion at low-voltage DC, the normal operation for the household appliance 200 provides electricity.In a power, it rectifies
Circuit mainly includes halfwave rectifier, full-wave rectification and three kinds of bridge rectifier, it will be understood that the full bridge rectifier 20 include but
Be not limited to the present embodiment disclosed rectifier system.
The discharge circuit 30 is in parallel with the safety capacitor 10, and the discharge circuit 30 includes the first discharge circuit 301
With the second discharge circuit 302.
First discharge circuit 301 connects with the output switching terminal, the second discharge circuit 302 and safety capacitor 10 respectively
It connects.As shown in figure 5, first discharge circuit 301 includes the 4th resistance R4 and first diode D1, the 4th resistance R4's
One end is connect with one end of the safety capacitor 10, the other end of the 4th resistance R4 and the anode of the first diode D1
Connection, the cathode of the first diode D1 are connect with the other end of the 3rd resistor R3.
Second discharge circuit 302 is also connect with the output switching terminal and safety capacitor 10.In the present embodiment, institute
Stating the second discharge circuit 302 includes the 5th resistance R5 and the second diode D2, one end of the 5th resistance R5 and the safety
The other end of capacitor 10 connects, and the other end of the 5th resistance R5 is connect with the positive of the second diode D2, and described the
The cathode of two diode D2 is connect with the other end of the 3rd resistor R3.
The switching circuit 40 is connected between the first output end and second output terminal of the full bridge rectifier 20, institute
Stating switching circuit 40 includes first switch circuit 401 and second switch circuit 402.
The first switch circuit 401 be connected to the full bridge rectifier 20 the first output end and second output terminal it
Between.In the present embodiment, the first switch circuit 401 includes first capacitor C1, voltage-stabiliser tube Z1, first resistor R1 and the one or three
The anode of pole pipe Q1, the first capacitor C1 are connect with the first output end of the full bridge rectifier 20, first electricity
Hold C1 cathode connect respectively with the second output terminal of the full bridge rectifier 20 and ground terminal, the voltage-stabiliser tube Z1 anode and
One end of the first resistor R1 connects, and the cathode of the voltage-stabiliser tube Z1 is connect with the positive of the first capacitor C1, and described the
The one resistance R1 other end is connect with the cathode of the first capacitor C1.In some embodiments, the resistance value of the first resistor R1
It is adjustable.
The second switch circuit 402 includes switch control terminal, switch input terminal and output switching terminal, the switch control
End and the switch input terminal are connect with the first switch circuit 401, the output switching terminal and the discharge circuit 30
Connection, wherein in standby mode, the work of first switch circuit 401 is on state, the second switch circuit 402
Work is in off state；In the shutdown state, the work of first switch circuit 401 is in off state, the second switch electricity
Road 402 works on state.
In the present embodiment, the second switch circuit 402 includes second resistance R2, the second triode Q2 and 3rd resistor
R3, one end of the second resistance R2 are connect with the cathode of the voltage-stabiliser tube Z1, the other end of the second resistance R2 with it is described
The base stage of second triode Q2 connects, and the emitter of the second triode Q2 is connect with the ground terminal, second triode
The collector of Q2 is connect with one end of the 3rd resistor R3, and the other end of the 3rd resistor R3 and the discharge circuit 30 connect
It connects.In some embodiments, the resistance value of the second resistance R2 is adjustable.
In some embodiments, the voltage-stabiliser tube Z1, first resistor R1, the first triode Q1, second resistance R2, the two or three
Pole pipe Q2 and 3rd resistor R3 can integrate in a module, which has 4 external interfaces (i.e. pin), this 4 outer
Portion's interface is connect with the cathode of the 4th resistance R4, the 5th resistance R5, the anode of first capacitor C1 and first capacitor C1 respectively.
To sum up, the specific course of work of the safety circuit 100 is as follows:
After the safety circuit 100 powers on, first output of the first capacitor C1 to the full bridge rectifier 20
Output voltage between end and the second output terminal of the full bridge rectifier 20 is filtered, the first capacitor C1 two
The voltage at end keeps stablizing.The voltage-stabiliser tube Z1 and first resistor R1 carries out voltage to the voltage at the both ends the first capacitor C1 and adopts
Sample (divides), when the sampled voltage of the voltage-stabiliser tube Z1 and first resistor R1 meets the turn-on condition of the triode Q1, institute
Triode Q1 conducting is stated, since the triode Q1 is connected, the base stage of the triode Q2 is pulled to ground terminal, is unsatisfactory for triode
The turn-on condition of Q2, the triode Q2 cut-off, first discharge circuit 301 and the second discharge circuit 302 being attached thereto
It does not work.At this point, the stand-by power consumption of 200 complete machine of household appliance is the electric current for flowing through the voltage-stabiliser tube Z1 and first resistor R1
Caused, the electric current is unrelated with the capacity of the safety capacitor 10, by adjusting the voltage-stabiliser tube Z1, first resistor R1 and the second electricity
The value of R2 is hindered, the stand-by power consumption of adjustable 200 complete machine of household appliance is allowed to meet the household appliance 200 different
The corresponding stand-by power consumption of output power.
After the safety circuit 100 power-off, the voltage of the first capacitor C1 is begun to decline, as the first capacitor C1
Voltage drop to certain value, the sampled voltage of the voltage-stabiliser tube Z1 and first resistor R1 are unsatisfactory for leading for the triode Q1
Gating condition, the triode Q1 cut-off, since triode Q1 ends, the base voltage of the triode Q2 is equal to second resistance R2
Partial pressure, meet the turn-on condition of the triode Q2, the triode Q2 conducting, first discharge circuit being attached thereto
301 and second discharge circuit 302 start to work, discharge the electricity that the safety capacitor 10 stores.Specifically, can be by adjusting
When the value of the voltage-stabiliser tube Z1 makes the voltage of the first capacitor C1 drop to certain value, the triode Q1 just ends, can
To avoid ripple interference.
As it can be seen that the safety circuit 100 provided by the utility model meets when powering on, in standby mode, by opening
Powered-down road 40 consumes power, unrelated with the capacity of safety capacitor 10, can by adjusting subelement in switching circuit 40 (including
First resistor R1 and second resistance R2) parameter reduce stand-by power consumption；After a loss of power (i.e. in power supply line plug), discharge circuit
The electricity that 30 pairs of safety capacitors 10 store in charge and discharge process is released.
The utility model embodiment provides a kind of safety circuit and household appliance.The safety circuit is in standby mode
When, switching circuit works on state, and external power supply consumes function after full bridge rectifier rectifies, through switching circuit
Rate, in the shutdown state, switching circuit work discharge the electricity of safety capacitor storage in off state, discharge circuit.Therefore, originally
Utility model can be realized in the discharge circuit of safety capacitor, and the stand-by power consumption of product is not dependent on the capacity of safety capacitor.
In addition, the safety circuit due to utility model is formed using discrete component, compared to using integrated IC to reduce costs.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Under the thinking of the utility model, it can also be combined between the technical characteristic in above embodiments or different embodiments,
Step can be realized with random order, and there are many other variations of the different aspect of the utility model as described above, be
Simplicity, they do not provide in details；Although the utility model is described in detail with reference to the foregoing embodiments, this
The those of ordinary skill in field it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments,
Or equivalent replacement of some of the technical features；And these are modified or replaceed, and do not make the sheet of corresponding technical solution
Matter departs from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. a kind of safety circuit, which is characterized in that including safety capacitor, full bridge rectifier, discharge circuit and switching circuit；
The safety capacitance connection is between the first input end and the second input terminal of the full bridge rectifier；
The discharge circuit is in parallel with the safety capacitor；
The switching circuit is connected between the first output end of the full bridge rectifier and second output terminal；In standby mode
When, the switching circuit work is on state, also, external power supply passes through institute after full bridge rectifier rectification
State switching circuit consumption power；In the shutdown state, in off state, the discharge circuit discharges institute for the switching circuit work
State the electricity of safety capacitor storage.
2. safety circuit according to claim 1, which is characterized in that the switching circuit includes:
First switch circuit, the first switch circuit connection are exported in the first output end of the full bridge rectifier and second
Between end；
Second switch circuit, including switch control terminal, switch input terminal and output switching terminal, the switch control terminal and described are opened
Input terminal is closed with the first switch circuit connection, and the output switching terminal connect with the discharge circuit, wherein standby
When state, the first switch circuit work is on state, and the second switch circuit work is in off state；In shutdown shape
When state, the first switch circuit work is in off state, and the second switch circuit work is on state.
3. safety circuit according to claim 2, which is characterized in that the first switch circuit includes first capacitor, steady
Pressure pipe, first resistor and the first triode；
The anode of the first capacitor is connect with the first output end of the full bridge rectifier, the cathode point of the first capacitor
It is not connect with the second output terminal of the full bridge rectifier and ground terminal；
The anode of the voltage-stabiliser tube is connect with one end of the first resistor, the cathode of the voltage-stabiliser tube and the first capacitor
Anode connection；
The first resistor other end is connect with the cathode of the first capacitor.
4. safety circuit according to claim 3, which is characterized in that the second switch circuit includes second resistance,
Two triodes and 3rd resistor；
One end of the second resistance is connect with the cathode of the voltage-stabiliser tube, the other end of the second resistance and the described 2nd 3
The base stage of pole pipe connects；
The emitter of second triode is connect with the ground terminal, the collector of second triode and the 3rd resistor
One end connection；
The other end of the 3rd resistor is connect with the discharge circuit.
5. safety circuit according to claim 4, which is characterized in that the discharge circuit includes the first discharge circuit and the
Two discharge circuits；
First discharge circuit respectively with the output switching terminal, second discharge circuit and the safety capacitance connection；
Second discharge circuit also with the output switching terminal and the safety capacitance connection.
6. safety circuit according to claim 5, which is characterized in that first discharge circuit includes the 4th resistance and the
One diode；
One end of 4th resistance is connect with one end of the safety capacitor, the other end and described first of the 4th resistance
The anode connection of diode；
The cathode of the first diode is connect with the other end of the 3rd resistor.
7. safety circuit according to claim 6, which is characterized in that second discharge circuit includes the 5th resistance and the
Two diodes；
One end of 5th resistance is connect with the other end of the safety capacitor, the other end of the 5th resistance and described the
The anode connection of two diodes；
The cathode of second diode is connect with the other end of the 3rd resistor.
8. safety circuit according to claim 1, which is characterized in that the safety capacitor is connect with the external power supply.
9. safety circuit according to claim 8, which is characterized in that the safety capacitor is connected in parallel on the external power supply
Between firewire and zero curve.
10. a kind of household appliance, which is characterized in that including the described in any item safety circuits of such as claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821469370.XU CN208797618U (en) | 2018-09-06 | 2018-09-06 | A kind of safety circuit and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821469370.XU CN208797618U (en) | 2018-09-06 | 2018-09-06 | A kind of safety circuit and household appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208797618U true CN208797618U (en) | 2019-04-26 |
Family
ID=66208908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821469370.XU Active CN208797618U (en) | 2018-09-06 | 2018-09-06 | A kind of safety circuit and household appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208797618U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117097139A (en) * | 2023-10-17 | 2023-11-21 | 恩赛半导体(成都)有限公司 | Auxiliary circuit, power supply system and power supply device |
-
2018
- 2018-09-06 CN CN201821469370.XU patent/CN208797618U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117097139A (en) * | 2023-10-17 | 2023-11-21 | 恩赛半导体(成都)有限公司 | Auxiliary circuit, power supply system and power supply device |
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